MP5496 PMIC is found on IPQ6018 SoC. SMPA2 regulator controls the APSS
voltage scaling. Document the sub node name for the same.
Signed-off-by: Kathiravan T <kathirav@codeaurora.org>
Link: https://lore.kernel.org/r/1596098964-19878-3-git-send-email-kathirav@codeaurora.orgSigned-off-by: Mark Brown <broonie@kernel.org>